Refactor DocumentMarkerController::Add*Marker() methods

third_party/WebKit/Source/core/editing/markers/DocumentMarkerController.h

Index: third_party/WebKit/Source/core/editing/markers/DocumentMarkerController.h
diff --git a/third_party/WebKit/Source/core/editing/markers/DocumentMarkerController.h b/third_party/WebKit/Source/core/editing/markers/DocumentMarkerController.h
index 513af1cee4086c5bcb0305f91b87526d0d67e1f2..a287b5a89a64141d1e51670275ba96dfe801b5a7 100644
--- a/third_party/WebKit/Source/core/editing/markers/DocumentMarkerController.h
+++ b/third_party/WebKit/Source/core/editing/markers/DocumentMarkerController.h
@@ -109,7 +109,10 @@ class CORE_EXPORT DocumentMarkerController final
                               unsigned new_length) final;
 
  private:
-  void AddMarker(Node*, DocumentMarker*);
+  void AddMarkerInternal(
+      const EphemeralRange&,
+      std::function<DocumentMarker*(int, int)> create_marker_from_offsets);
+  void AddMarkerToNode(Node*, DocumentMarker*);
   void AddSpellCheckMarker(const EphemeralRange&,
                            DocumentMarker::MarkerType,
                            const String& description = g_empty_string);